Feature to drag a file from Windows (client) to Mac (server):

- changed the size of the window for dragging on Mac to 3 by 3 pixels.
- on server side, use a new thread to write file to the drop directory.

src/lib/platform/COSXScreen.h

@@ -345,7 +345,6 @@ private:
 
 	IEventQueue*			m_events;
 	
-	bool					m_fakeDraggingStarted;
 	CThread*				m_getDropTargetThread;
 	CString					m_dropTarget;
 };